Final answer:
The number of receptacles on a branch circuit is determined by dividing the rating of the overcurrent protection device by 1.5A, with safety considerations limiting continuous use to 80% of the breaker's capacity. High-wattage appliances can cause the breaker to trip if the total current drawn exceeds this capacity.
Step-by-step explanation:
The question pertains to the number of receptacles allowed on a branch circuit which is determined by the over current protection device (OCPD) rating and a calculation involving amperage. A circuit breaker's ampere rating is used to discern the total permissible amperage draw from all appliances on that circuit. For example, a 15-amp breaker should support up to 15 amps of current draw before tripping to prevent overload, which means it can typically support 10 outlets considering a 1.5A draw per outlet (15A / 1.5A per outlet = 10 outlets). However, it's important to consider safety regulations that limit continuous use to only 80% of the breaker's capacity. Given this limitation, a 15-amp breaker effectively permits a continuous draw of up to 12 amps, adjusting the number of allowable receptacles accordingly.
The use of several high-wattage appliances, like an 1800-W toaster, a 1400-W electric frying pan, and a 75-W lamp on the same 15-A, 120-V circuit, can be concerning. To calculate the current drawn by each, you would use the formula Power (in watts) / Voltage = Current (in amps). If the total calculated current exceeds the circuit breaker's capacity, the breaker will trip to protect the circuit, demonstrating the crucial role of the OCPD in circuit protection.